Differential immediate and long-term effects of nitrogen input on denitrification N2O/(N2O+N2) ratio along a 0‒5.2 m soil profile.

ABSTRACT: High nitrogen (N) input to soil can cause higher nitrous oxide (N2O) emissions, that is, a higher N2O/(N2O+N2) ratio, through an inhibition of N2O reductase activity and/or a decrease in soil pH. We assumed that there were two mechanisms for the effects of N input on N2O emissions, immediate and long-term effect. The immediate effect (field applied fertilizer N) can be eliminated by decreasing the N input, but not the long-term effect (soil accumulated N caused by long-term fertilization). Therefore, it is important to separate these effects to mitigate N2O emissions. To this end, soil samples along a 0‒5.2 m profile were collected from a long-term N fertilization experiment field with two N application rates, that is, 600 kg N ha-1 year-1 (N600) and no fertilizer N input (N0). External N

SUBMITTER: Yuan H 

PROVIDER: S-EPMC9621404 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature